This seems to be the opposite of what most breeders think. Our VPI pastel is one of the best I've seen. From what I have seen, Jolliff line is the most brown as adults, then SK, and VPI seem to hold the silver more than any other line. This isn't just my opinion either.
Here is our VPI Pastel female at around 1800-2000 grams.
Same snake indoor with flash during her ovulation.
Again, choose whichever line you like the best. What I have seen over the last 10 years or so is VPI is the top choice of most breeders.